Running out of storage on your smartphone? Is a 64GB microSD card simply not enough anymore? Flash storage company SanDisk aims to fix the dilemma more and more mobile users are facing every day: cramped storage space.

The company just unveiled the world’s highest-capacity microSD card in Barcelona, Spain for MWC. SanDisk has doubled the capacity of its impressive 64GB microSDXC cards to 128GB. The cards are said to have double the write speed as your standard microSD card, or 10MBps.

In order to squeeze 128GB into such a tiny area – about the size of a fingernail – SanDisk developed a proprietary technique for vertically stacking 16 memory die, “each shaved to be thinner than a strand of hair,” according to the company.

The 128GB Ultra microSDXC cards are designed to be used in Android smartphones and tablets, with the a new version SanDisk Memory Zone application, which is available in Google Play as a beta. This new version of the application comes with the OptiMem feature, which automatically transfers old photos and videos from the phone’s internal to external storage.

The 128GB Ultra microSDXC cards MSRP for $199 and are available exclusively through BestBuy.com and Amazon starting today.